Anchor and method of installing anchor

Abstract

An anchor comprises an anchor bolt having a shaft and a bolt head, a spreading sleeve having spreading parts provided at a tip portion of a tubular body capable of being fitted on a tip portion of the shaft and a cone nut provided at its inner side a screw through hole to threadedly engage with the shaft. The shaft of the anchor bolt is composed of a thick shaft part connected to the bolt head, and a thin shaft part provided to be closer to the tip portion of the shaft. The thick shaft part is provided with a rupture portion reduced in diameter. The rupture portion is provided at a position spaced by a predetermined length from the step between the thick shaft part and the thin shaft part and ruptures if torque of a predetermined value acts on the bolt head.

Description

[0001]This application is based on the applications Nos. 2012-020474 and 2012-257321 filed in Japan, the contents of which are hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to an anchor to be attached to various types of skeletons such as concrete buildings and structures, and a method of installing the anchor.[0004]2. Background Art[0005]In order to attach hanging objects such as air conditioners, lighting fixtures, and various types of pipes to an existing ceiling structure of a concrete building, for example, anchors to support the hanging objects are fixed to the ceiling structure. These anchors may be fixed not only to a ceiling structure but also to a wall surface or a floor. Conventionally known anchors of this type are disclosed for example in Japanese Patent Applications Laid-Open Nos. 10-231583 (1998) (patent literature 1) and 10-110475 (1998) (patent literature 2).[0006]Referring for example ...

AI Technical Summary

Benefits of technology

The present invention provides an anchor that can be installed on a ceiling structure or any other object with excellent working efficiency. The anchor has a rupture portion that allows easy examination of the installation condition. The anchor is made of a shaft and a bolt head separated by a small rupture portion. The use of a high-resistance material or coating on the rupture portion prevents corrosion. The technical effects of this invention are that it allows for direct attachment of anchor to a ceiling structure and easy inspection of the installation condition.

Problems solved by technology

The anchor of patent literature 1 is not suited for fixation to a ceiling structure.

So, if the ceiling structure is shaken strongly for example by an earthquake, the cone nut falls off the inside of the spreading sleeve, resulting in drop of the spreading sleeve integrated with the tip portion of the steel bar from the ceiling structure.

This generates another problem in that it is difficult to determine during installation or after the installation if the anchor is fixed to a skeleton with sufficient strength.

Hence, some sort of problem may be generated if the operations are not performed efficiently.

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